Potassium is a mineral found in most foods and some beverages. Potassium helps your muscles work properly and your heart to beat normally. Your kidneys help to keep your blood potassium at a healthy level. When your kidneys are not working, potassium can build up in your blood. Certain medications can also increase your potassium level. High potassium levels in your blood can make your heart beat abnormally or even cause the heart to stop working.
Click here to read more about the Low potassium diet (Dietitians of Canada)